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New ID copy code (rBrB9da7dfa1586d) Breaks node previews in compositor.
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Description

System Information
NA

Blender Version
Broken: rB9da7dfa1586d
Worked: 2.79RC1

Short description of error

Since rBrB9da7dfa1586d (new ID copying code), previews are not rendered at all in compositing nodes.

Event Timeline

Bastien Montagne (mont29) renamed this task from rBrB9da7dfa1586d Breaks node previews in compositor. to New ID copy code (rBrB9da7dfa1586d) Breaks node previews in compositor..

Lots of investigations already, with very little results…

Ended up bisecting inside id_copy_rework branch, and breaking commit is rBa8e4aae09104d596798aefc9ce7ff3836a2425a1. Still do not understand why. :|

(Obvious thinking is change to BKE_libblock_alloc(), of course, but… what?)